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FAIR VALUE MEASUREMENTS - CHANGES IN VALUE OF EMBEDDED DERIVATIVES (Details) - Fair Value, Inputs, Level 3 - Fixed Index Annuity Products - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Liabilities: |  |  |  |
Balance at beginning of the period | $ 1,564.2 | $ 1,450.2 | $ 1,600.6 | $ 1,471.6
Premiums less benefits | (3.6) | (7.5) | (13.0) | (16.0)
Change in fair value, net | 116.1 | 59.7 | 89.1 | 46.8
Balance at end of the period | $ 1,676.7 | $ 1,502.4 | $ 1,676.7 | $ 1,502.4

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Increase (Decrease) in Fair Value + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Premiums Less Benefits + References No definition available. + Details
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